eye test that clears double vision? explainaiton needed

[Rick_101]

HI All

Is there anyone out there that can explain optically why when looking passed the bottom of the card
as demonstrated in the in the linked photo below , that all things become in focus close to the edge of the card?


Thanks, Rick_101

https://picasaweb.google.com/lh/photo/p3zkrHarjsgCxFU7wiojgKX9j-0g6W-quyNtFg63Jio?feat=directlink

[Rick_101]

Thanks for the rapid reply, you are right, I made a pair of Pinhole glasses in about 2 minutes, they have the same affect as the card thanks.

That being said and now knowing that the pinhole effect corrects my diplopia vision problem ~ Question: In this situation knowing the above test result, could one still consider cataracts the cause for the diplopia?

Actually Dr O they seem clear up aberrations  in all fields, including reading, I wear trifocals.

Sincerely, Rick_101

[Ray T Oyakawa, MD]

This is similar to squinting your eyes.  It creates a pinhole effect.

Dr. O.

[Rick_101]

sorry bout that ~  I meant explanation